A specialized visual inspection tools designed for examining areas that are otherwise inaccessible. In medical applications, similar devices are known as endoscopes. Primarily used in non-destructive testing, borescopes help identify defects or imperfections in various industrial components.

They are commonly employed for inspecting boilers, aircraft engines, aero-derivative industrial gas turbines, steam turbines, diesel engines, heat exchanger tubes, and automotive and truck engines. Gas and steam turbines, in particular, require thorough inspection due to strict safety and maintenance requirements. Borescope inspections can help prevent unnecessary maintenance, which is especially beneficial for large turbines where repairs can be extremely costly. Additionally, in manufacturing, borescopes are used to examine machined or cast parts, ensuring critical interior surfaces are free of burrs, meet surface finish standards, and contain fully formed through-holes.